add stringVPrintf() and stringVAppendf()
Summary: This adds versions of stringPrintf() and stringAppendf() that accept va_list arguments. This also fixes the existing stringPrintf() functions to properly call va_end() even when an exception is thrown in stringPrintfImpl(). Test Plan: Included new unit tests for stringVPrintf() and stringVAppendf(). Reviewed By: davejwatson@fb.com Subscribers: trunkagent, doug, net-systems@, exa, njormrod FB internal diff: D1583675
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